Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59765212eb67438…

MALICIOUS

PDF

77.0 KB Created: 2021-03-04 01:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 783813e3eb33cb786ea19e7458a0ab6b SHA-1: 46b87d86b3c7dcbbc868488d601d259a3b1a41b4 SHA-256: c59765212eb67438c464df799ea27d3aba0d3318152a4115e481ac0e607fe79c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a primary focus on `https://pelibifir.ru/wix?keyword=calendar+365.com+2020+india`. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/wix?keyword=calendar+365.com+2020+india PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444636/normal_6012db9b7a6aa.pdfIn PDF document text
    • https://cdn.sqhk.co/mebosuxular/DMxJPhc/love_quotes_for_him_with_images.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5ff0ea80954d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5fe829a769edb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476925/normal_5fca7d8631cef.pdfIn PDF document text
    • https://vazemewezasal.weebly.com/uploads/1/3/0/7/130775722/4647556.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/gemiz_jemafe_xutubo_ridexatawuxovo.pdfIn PDF document text
    • https://wetuwene.weebly.com/uploads/1/3/5/4/135400298/2776373.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/cgggjhK/diy_surgical_mask_no_sewing_machine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jevelel/wekipeso.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/rarukon.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/tunibijavizifaras.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/autodesk_maya_2018_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/vagigubasikorikudunom.pdfIn PDF document text
    • http://sazeborotuvovam.rf.gd/gezivezozexovo.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/halloweentown_full_movie_in_tamil.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 5560 bytes
SHA-256: eb0b9f29ab2a70e43bf8a0c88099411e76e974eb9bea4dd1590c0f8343f18f17
font_01_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 11008 bytes
SHA-256: 6735bb1567ff1d71511860b1b5671304b41342c69edc5eb90cd435a983949eea
font_02_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 16172 bytes
SHA-256: fb36930b6158726aadc5cec8e2937717261789c1ed468292f33a1ffb1951f124

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